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..... The earliest tengu were pictured with beaks, but this feature has often been humanized as an unnaturally long nose, which today is widely considered the tengu's defining characteristic in the popular imagination.

Buddhism long held that the tengu were disruptive demons and harbingers of war. Their image gradually softened, however, into one of protective, if still dangerous, spirits of the mountains and forests.

a comedy manga series written and illustrated by Yūgo Ishikawa which was adapted into a 26-episode anime series, broadcast by Animax in 2005.

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A young man named Watashi, upon passing by a pet shop on his way home, happens upon a water Kappa in the window, which he buys, names Kaatan, and is determined to raise as a pet. Never having owned a kappa before, he relies on a book that specializes in information on how to raise and train kappa. However, Kaatan is harder to train than it immediately seems, and a lot of patience is exerted by Watashi in his effort.

yookai wotchi, Yōkai Wotchi 妖怪ウォッチ - Yo-Kai Watch
trademarked in Japan invariably as Youkai Watch and Yokai Watch) is a role-playing video game developed and published by Level-5. source : wikipedia

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- quote“Yōkai Watch”: Japan’s Netherworld Hit Poised to Go Overseas
Since its release in July 2013, the video game Yōkai Watch has rapidly risen to megahit status in Japan. The game’s characters now star in their own animated program, as well as adorning everything from snack packages to trains. Level-5, the company that produces the game, has taken great care in engineering its blockbuster for surefire success, borrowing winning ideas from a number of other franchises. The breakout popularity of the game has prompted daring comparisons to Japanese superstar Pokémon, with some even saying it has the potential to surpass its predecessor.- source : www.nippon.com

- quote - 8 Videogame Characters Based On Japanese Folklore 1. Kapp’n (Animal Crossing)
You might recognize Kapp’n as the green sea turtle who ferries villagers to Tortimer Island in the Animal Crossing games. But did you know that he’s not actually meant to be a turtle at all but a water spirit called a kappa?
Kappas are mischievous spirits said to haunt rivers, ponds and lakes. They were often blamed for drowning horses and in some cases children, so to appease them individuals would throw cucumbers (the kappa’s favorite food) into water prior to bathing or swimming. This would allow them to swim unmolested.
The depiction of the kappa as malevolent has somewhat softened over time. It has instead given way to a more lighthearted representation—one that doesn’t involve murder or drowning. It’s this 20th century reinterpretation of the kappa that inspired the character of Kapp’n in the Animal Crossing games. Similarities between Kapp’n and the kappa include their appearance, their name (in the Japanese version of the game at least) and their mutual love of cucumbers.